Base for incandescent lamps or similar articles



l. H. VA'N HORN BASE FOR-INCANDESCENT LAMPS 0R SIMILAR ARTICLES Dec. 111, 1928.

Filed Sept. 20, 1926 .3, f z llllllazlllflllllll .HE's Arr/JEWEL:

Patented Dec. 11, 1928.

UNITED STATES I I 1,694,997 PATENT OFFICE.

IRVING H. VAN HORN, OF EAST CLEVELAND, OHIO, ASSIGNOR TO GENERAL ELFCTRIC COMPANY, A CORPORATION OF NEW YORK.

BASE FOR INCANDESCENT LAMBS R SIMILAR ARTICLES.

Application filed september 20, 1926; Serial No. 136,405.

My invention relates to bases for electric incandescent lamps and similar devices. In high wattage lamps, particularly of the gasfilled type disclosed in United States Patent 1,180,159, convection currents cause the heat to be transferred rapidly from the filament to the base of the lamp. In lamps of the higher wattage gas-filled type, considerable difficulty has been experienced in obtaining l a basing cement which would stand this heat and securely hold the base to the lamp after it had been in operation a short while.

According to my invention, I overcome this difiiculty by providing a clamping means in the form of an auxiliary portion which may be attached to an ordinary lamp base or may form part of the base itself, and when properly placed on an incandescent lamp bulb will securely hold the ,base thereto under all 2 temperature conditions. My invention also has the advantage that the basing cement may be entirely dispensed with, thereby causing a saving in the manufacture of these lamps. Other features and advantages will appear from the following description taken in connection with the accompanying drawings, in which:

Fig. 1 is an elevation of a species of a clamp and base constructed in accordance with my invention; Fig. 2 is asectional plan along the line 22 of Fig. 1; Fig. 3 is an elevation of a gas-filled electric incandescent lamp having my invention applied thereto; and

Fig. 4 is an enlarged section along the line 4-4 of Fig. 3.

, Referring to the drawing, and particularly Fig. 3, 10 is a bulb of an electric incandescent lamp having a stem 11. The leading-in conductors 12 and 13 have their ends sealed into the flattened portion 14 of the stem and are electrically connected to the metal supports 15 and'16 respectively, the ends of which are also embedded in the flattened portion 14.

The said conductor supports 15 and 16 are electricallyconnectedat their other ends to a filament- 17, which, as shown, is of the concentrated coiled type. The flattened portion 14 of the stem 11 has extending therefrom a glass arbor 18 which extends into an arbor tube 19, said tube being supported-by the horizontally disposed wires 20-21,attached to the conductor supports 15 and 16 respectively. The above described construction is of the same general type asthat disclosed in my prior applicatiomSerial No. 113,315,

filed June 22, 1926, for electric incandescent lamps. A plurality of wire hooks or sup ports 22 carried by the arbor tube 19 engage. the filament 17 and serve to support and maintain it in the desired shape.

The lamp bulb 10 comprises a suitable ncclc23, the end of which receives the skirted. portion 24 of an ordinary lamp base 25. A

quantity of cement 26 applied to the interior of the skirted portion serves to hold the base and bulb together in most cases, but with lamps of especially high Wattage, the tem perature is great and the baffle or disc, such as 27 shown in Fig. 3, will not always serve to prevent the heat from injuriously affectlng the cement and causing the base to become loosened from the bulb neck. This difliculty is overcome by a clamp which may be integral with the base or may be attached to the skirted portion thereof. As shown in the drawing, the clamp consists of a metal stamping (preferably brass) in the form of a split ring'or sleeve 28 having a plurality of fingers 29 which are attached to the skirted portion 24 of the base. The sleeve 28 may After the ring has been properly tightened a tab 33 which extends through a slot 34 of the sleeve is bent back upon itself as shown in Fig. 2 so as to securely clamp and lock it.

In order to insure the security of the sleeve, about the neck of the bulb, an adhesive such as sodium silicate may be applied to the in tension engaging an intermediate portion of said neck, and means for holding the adjacent ends of said rin together to causesaid ring'to grip said neck.

comprising a split ring, integral with said ex- -2. The combination of an electric incandescent lamp comprising a neck and a bowl portion vand a base having the usual portion carrying the electrical terminals and engaging the end of said neck and a gripping extension comprising a split ring integral with said extension engaging an intermediate portion of said neck, and means whereby the adjacent ends of said ring may be drawn together and locked to cause said ring to grip said neck.

3. The combination of an electric incandescent lamp comprising a neck and a bowl portlon and a base having the usual portion carrying electrical terminals and engaging the end of said neck, a split ring engaging an intermediate portion of said neck and a plurality of fingers depending from the lower portion of said base and integral Witlvand supporting said ring, and means for holding.

, the adjacent ends of said ring together to cause said ring to grip said neck.

4. The combination of an electric incandescent lamp comprising a neclr'and a bowl portion and a base havingthe usual portion carrying the electrical terminals and engaging the end of said neck, a s lit ring engaging an intermediate portion 0 said neck and a pluality offingers depending from the lower portion of said base and integral with and supporting said ring, heat insulating means interposed between said ring and sald neck, and means for holding the adjacent ends of said rin together to cause said ring to grip said nec 5. The combination of an electric incandes cent lamp comprising a neck and a bowl portion and a base having the usual portion carrying the electrical terminals and engag ing the end of said neck and a gripping extension comprising a split ring iptegral with said extension engaging an intermediate portion of said neck, and means formed integral with said ring for locking its adjacent ends together to grip said neck. In witness whereof, I have hereunto set my hand this 17th day of September, 1926.

IRVING H. VAN HORN. 

